What Is The Manufacturing Process of Glass Fiber Stitched Fabrics?

  Stitched fabric is one of the knitting methods, warp knitting method based on the development of evolution. Therefore, in the United States is also often called knitted fabrics, knitted felts) and sewing composite. In Europe is also called non-flexing fabrics, which is relative to woven fabrics, highlighting the warp and weft yarns of sewn fabrics without weaving flexing characteristics.

  Stitched fabric development of the original idea is to simplify the hand FRP molding process, change the multi-layer paste for single-layer paste, which appeared in the 70s sewing fabric early process, that is, the glass fiber short-cut felt and no robbing roving cloth both with sewing machine sewn together. At that time, Europe and the United States have formed a certain scale of production, and some factories still retain this original production method. Its sewing products to a certain extent to simplify the FRP molding process and improve the performance of the interlayer, but the overall cost is higher, the benefits did not significantly improve. Subsequently, the German factory to further develop the sewing technology, with glass fiber untwisted roving as warp and weft yarns, organic fiber yarns for sewing threads, through a special sewing machine into a unidirectional and bi-directional sewing fabrics to partially replace the roving fabrics without robbery. This is a step forward than the simple sewing, but still do not really solve the problem of multi-layer composite. 80's some companies in the United States began to make more research work on this. American Hexcel company first proposed the concept of multi-axial sewing fabric. France's LIBA company based on this, the transformation of the traditional warp knitting machine, so that the concept of multi-axial fabrics become a reality. In the early stage, the use of cross weft technology, that is, along the length of the cloth into a 90 ° angle distribution of the weft yarn is not absolutely 90 “angle, each bunch of weft yarns and another bunch of weft yarns in the edge of the overlap, cross, and slightly curved. The same direction with the length of the cloth into Shi 45 ° angle distribution of the weft yarn is also this situation, so that the mechanical properties of the fabric has a certain loss. Foreign countries in recent years and after a lot of research finally solved the problem of parallel weft, technology and equipment have made further improvements and enhancements, the 90's France's LIBA company publicly introduced the parallel weft research results. Germany MALIMO company also introduced its parallel weft sewing machine, so that the current multi-axial sewing technology has reached a new level.